Bug 1726419

I'm affected by this bug too.

Problem solved by
dnf downgrade xorg-x11-server-Xorg-1.20.4-3.fc30 xorg-x11-server-common-1.20.4-3.fc30.x86_64

In my case:
o) The graphics hardware is Radeon HD 5870.
o) The bug affects only KDE panel.
o) The bug can be reproduced on xorg-x11-server-Xorg-1.20.4-3 as well by running and quitting Wesnoth.

Created attachment 1586913 [details]
How the panel looks like when the bug is triggered

(In reply to Paweł Brodacki from comment #1)
> I'm affected by this bug too.
 
The picture in attachment 1586913 [details] is not tearing, this corruption, I doubt this is the same issue.

> Problem solved by
> dnf downgrade xorg-x11-server-Xorg-1.20.4-3.fc30
> xorg-x11-server-common-1.20.4-3.fc30.x86_64

What exact version (n-v-r) of the Fedora package for xorg-x11-server-Xorg are you using?
 
> In my case:
> o) The graphics hardware is Radeon HD 5870.
> o) The bug affects only KDE panel.
> o) The bug can be reproduced on xorg-x11-server-Xorg-1.20.4-3 as well by
> running and quitting Wesnoth.

So you can reproduce with xorg-x11-server-Xorg-1.20.4-3 as well? That's not a regression in 1.20.5 then.

This is confusing because you mentioned “Problem solved by dnf downgrade xorg-x11-server-Xorg-1.20.4-3.fc30” and then “The bug can be reproduced on xorg-x11-server-Xorg-1.20.4-3 as well”, you lost me there...

I would suggest to:

1. File a different bug, your screen-shot does not show tearing but plain corruption
2. Try to reproduce with different versions of the Xserver (dnf downgrade) and if possible identify the first exact package version which introduced the issue (we do add patches downstream, so every release counts)
3. Make sure to mention the exact version of the package affected.

(In reply to André from comment #0)
> Description of problem:
> 
> The newest xorg update version 1.20.5 has screen tearing on some systems.

Please provide the exact package version, “newest” tends to be unclear over time.

> my case it's a  HD 620 (problem happens with both kernel/nomodeset and
> xorg's xf86 intel drivers).  Had to downgrade to 1.20.4-3.fc30 from fedora
> repository.
> 
> Upstream bug report: https://gitlab.freedesktop.org/xorg/xserver/issues/839
> 
> Arch users talking about this issue:
> https://www.reddit.com/r/archlinux/comments/bxsfy4/xorgserver12051_is_broken/

Every distribution can add patches to their packages, I'd rather focus on Fedora, considering this is a Fedora bugzilla.

Version with tearing: 1.20.5-3.fc30 (updates)
Version without tearing: 1.20.4-3.fc30 (fedora)

(In reply to André from comment #5)
> Version with tearing: 1.20.5-3.fc30 (updates)
> Version without tearing: 1.20.4-3.fc30 (fedora)

Could you please try this scratch (test) build so see if it helps with the issue?

https://koji.fedoraproject.org/koji/taskinfo?taskID=36015101

(In reply to Olivier Fourdan from comment #6)
> (In reply to André from comment #5)
> > Version with tearing: 1.20.5-3.fc30 (updates)
> > Version without tearing: 1.20.4-3.fc30 (fedora)
> 
> Could you please try this scratch (test) build so see if it helps with the
> issue?
> 
> https://koji.fedoraproject.org/koji/taskinfo?taskID=36015101

I've downloaded and installed all .rpms for x86_64 and rebooted the computer. Didn't fix it at all (still have tearing).

(In reply to Paweł Brodacki from comment #2)
> Created attachment 1586913 [details]
> How the panel looks like when the bug is triggered

Following bugreport shows the same corruption with KDE tooltips:

https://bugzilla.redhat.com/show_bug.cgi?id=1725499

(In reply to André from comment #7)
> (In reply to Olivier Fourdan from comment #6)
> > Could you please try this scratch (test) build so see if it helps with the
> > issue?
> > 
> > https://koji.fedoraproject.org/koji/taskinfo?taskID=36015101
> 
> I've downloaded and installed all .rpms for x86_64 and rebooted the
> computer. Didn't fix it at all (still have tearing).

Thanks, that's a relief! So I think this really is an upstream issue.

I've reverted the patch Michel pointed out upstream and ran a new scratch build:

https://koji.fedoraproject.org/koji/taskinfo?taskID=36027647

Can you try this new one?

(In reply to Olivier Fourdan from comment #9)
> (In reply to André from comment #7)
> > (In reply to Olivier Fourdan from comment #6)
> > > Could you please try this scratch (test) build so see if it helps with the
> > > issue?
> > > 
> > > https://koji.fedoraproject.org/koji/taskinfo?taskID=36015101
> > 
> > I've downloaded and installed all .rpms for x86_64 and rebooted the
> > computer. Didn't fix it at all (still have tearing).
> 
> Thanks, that's a relief! So I think this really is an upstream issue.
> 
> I've reverted the patch Michel pointed out upstream and ran a new scratch
> build:
> 
> https://koji.fedoraproject.org/koji/taskinfo?taskID=36027647
> 
> Can you try this new one?

It works! No tearing using this one. Thank you.

(In reply to André from comment #10)
> It works! No tearing using this one. Thank you.

Thanks for testing! Now awaiting the feedback from bug 1725499 as well, and I'll push that in Fedora.

FEDORA-2019-645cab930b has been submitted as an update to Fedora 30. https://bodhi.fedoraproject.org/updates/FEDORA-2019-645cab930b

xorg-x11-server-1.20.5-4.fc30 has been pushed to the Fedora 30 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2019-645cab930b

xorg-x11-server-1.20.5-4.fc30 has been pushed to the Fedora 30 stable repository. If problems still persist, please make note of it in this bug report.